VMX Office also comes equipped with five hours of talk time and more than 100 standby hours.Your 3 p.m. treadmill session/conference call awaits. Feature: Reduces the clutter in your life by combining three headsets into one Up to 5 hours of talk time on a single charge Revolutionary technology utilizes both Bluetooth wireless, wireless office, and VoIP technology. One headset for your office phone, mobile phone, and PDA Up to 100 ft. range for office phones and up to 33 ft. with Bluetooth devices like computers and mobile phones Mute button allows for private, off-headset conversations or while you're ordering a coffee Features Sennheiser VoiceMax technology reduces invasive background noise and picks up and enhances human voices